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Bach, R. N.
  1950. Some general aspects of North Dakota water areas
      and their study. North Dakota Game and Fish
      Department. 12 p. mimeo.
    
Conard, H. S.
  1956. How to know the mosses and liverworts Rev. ed.
      Wm C. Brown Co. Dubuque, Ia. 226 p.
    
Evans, C. D., and K. E. Black.
  1956. Duck production studies on the prairie potholes of
      South Dakota. U. S. Fish and Wildlife Service, Special
      Scientific Report-Wildlife, No. 32. 59 p.
    
Fernald, M. L.
  1950. Gray's manual of botany. 8th ed. American Book
      Co., New York. Ixiv + 1632 p.
    
Hayden, A.
  1943. A botanical survey in the Iowa Lake Region of Clay
      and Palo Alto Counties. Iowa State College journal of
      Science, Vol. 17, No. 3, p. 277-416.
    
Leitch, W. G.
  1966. Historical and ecological factors in wetland inventory.
      Transactions of the 31st North American Wildlife and
      Natural Resources Conference, p. 88-96.
    
Lemke, R. W., W. M. Laird, M. J. Tipton, and R. M. Lindvall.
  1965. Quaternary Geology of Northern Great Plains, p. 15
      to 27. In The Quaternary of the United States, edited by
      H. E. Wright, Jr., and D. G. Frey. Princeton University
      Press. 922 p.
    
Martin, A. C., N. Hotchkiss, F. M. Uhler, and W. S. Bourn.
  1953. Classification of wetlands of the United States. U. S.
      Fish and Wildlife Service, Special Scientific Report-
      Wildlife, No. 20. 14 p.

Mason, H. L.
  1957. A flora of the marshes of California. University of
      California Press, Berkeley. 878 p.
  
Metcalf, F. P.
  1931. Wild duck foods of North Dakota lakes. U. S.
      Department of Agriculture, Technical Bulletin 221. 72 p.

Millar, J. B.
  1964. Canadian Wildlife Service, Annual Progress Report,
      Cooperative Wetlands Habitat Investigation, Project 01-5-1.
      86 p.

Nord, W. H., C. D. Evans, and G. E. Mann.
  1951. Ducks and drainage. U. S. Fish and Wildlife Service,
      Office of River Basin Studies. 86 p.

Shaw, S. P., and C. G. Fredine.
  1956. Wetlands of the United States. U. S. Fish and
      Wildlife Service, Circular 39. 67 p.

Smith, G. M.
  1950. The fresh-water algae of the United States. 2d ed.
      McGraw-Hill Book Co., New York, 719 p.

Stevens, 0. A.
  1963. Handbook of North Dakota plants. North Dakota
      Institute for Regional Studies, Fargo. 330 p.

Stewart, R. E., and H. A. Kantrud.
  1963. Long-term investigations of pothole complexes on the
      Missouri Coteau in Stutsman County, North Dakota.
      Denver Wildlife Research Center, Annual Progress
      Report, Wildlife Research Work Unit A-7.1. 62 p.
  1969. Proposed classification of potholes in the glaciated
      prairie region. Saskatoon Wetlands Seminar. Canadian
      Wildlife Service, Report Series, No. 6, p. 57-69.
    
  In press. Vegetation of prairie potholes, North Dakota, in
      relation to quality of water and other environmental
      factors. U. S. Geological Survey, Professional Paper 585-D.